This is a note to let you know that I've just added the patch titled
net: bpf: Allow TC programs to call BPF_FUNC_skb_change_head
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-bpf-allow-tc-programs-to-call-bpf_func_skb_change_head.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6f3f65d80dac8f2bafce2213005821fccdce194c Mon Sep 17 00:00:00 2001
From: Lorenzo Colitti <lorenzo@xxxxxxxxxx>
Date: Mon, 20 Apr 2020 11:34:08 -0700
Subject: net: bpf: Allow TC programs to call BPF_FUNC_skb_change_head
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
From: Lorenzo Colitti <lorenzo@xxxxxxxxxx>
commit 6f3f65d80dac8f2bafce2213005821fccdce194c upstream.
This allows TC eBPF programs to modify and forward (redirect) packets
from interfaces without ethernet headers (for example cellular)
to interfaces with (for example ethernet/wifi).
The lack of this appears to simply be an oversight.
Tested:
in active use in Android R on 4.14+ devices for ipv6
cellular to wifi tethering offload.
Signed-off-by: Lorenzo Colitti <lorenzo@xxxxxxxxxx>
Signed-off-by: Maciej Żenczykowski <maze@xxxxxxxxxx>
Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx>
Cc: Nicolas Dichtel <nicolas.dichtel@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/core/filter.c | 2 ++
1 file changed, 2 insertions(+)
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -6196,6 +6196,8 @@ tc_cls_act_func_proto(enum bpf_func_id f
return &bpf_skb_adjust_room_proto;
case BPF_FUNC_skb_change_tail:
return &bpf_skb_change_tail_proto;
+ case BPF_FUNC_skb_change_head:
+ return &bpf_skb_change_head_proto;
case BPF_FUNC_skb_get_tunnel_key:
return &bpf_skb_get_tunnel_key_proto;
case BPF_FUNC_skb_set_tunnel_key:
Patches currently in stable-queue which might be from lorenzo@xxxxxxxxxx are
queue-5.4/net-bpf-allow-tc-programs-to-call-bpf_func_skb_change_head.patch
